Technical interview questions and drills

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Showing the Java & Spring Backend curriculum. Technology tags describe each drill's actual implementation context; shared drills can belong to more than one track.

Architecture scenarioHard~10 min

How do you choose metric names and tags without causing a cardinality problem?

Builds stable Micrometer dimensions that answer operational questions without unbounded time series and cost.

In Java & Spring Backend

Java

Drills

How do you choose metric names and tags without causing a cardinality problem?

How do you configure and debug CORS in Spring MVC?

How do you decide between Spring Data repository methods, projections, and custom repository code?

How do you design an ExecutorService for a Java backend?

How do you diagnose a missing or ambiguous Spring bean?

How do you diagnose and fix an N+1 query problem in Hibernate?

How do you diagnose a request rejected before a Spring controller runs?

How do you diagnose Java classpath and linkage errors?

How do you evolve and version a Spring MVC API?

How do you expose pagination, filtering, and sorting safely in a Spring API?

How do you handle 401 versus 403 responses in Spring Security?

How do you handle circular dependencies between Spring beans?

How do you implement global API error handling with @ControllerAdvice and ProblemDetail?

How do you make large JPA write batches efficient and safe?

How do you map domain failures to HTTP responses in a Spring API?

How do you preserve trace context across HTTP calls and asynchronous work in Spring?

How do you reason about garbage-collection latency, throughput, and tuning?

How do you safely override or exclude Spring Boot auto-configuration?

How do you stream a large response from Spring MVC safely?

How do you test an outbound HTTP client in a Spring application?

How do you test Spring Security authentication and authorization rules?

How do you unit-test a Spring service without loading ApplicationContext?

How do you use a prototype or request-scoped bean from a Spring singleton?

How do you use Java thread dumps to diagnose a slow or stuck service?